Kingdom Monera

Bacteria are prpkaryotic, microscopic organisms which do not have true nucleus and other cytoplasmic cell organelles like mitochondria, Golgi complex, endoplasmic reticulum etc. The plasma membrane of bacteria becomes infolded at some places, these are known as mesosomes and are considered the sites of respiration. These are comparable to mitochondria of eukaryotes because both are the sites of respiration i.e., catabolism.